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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 9, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1270-1277; doi:10.1093/icesjms/fsp090
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

Consecutive acoustic observations of an Atlantic herring school in the Northwest Atlantic

Thomas C. Weber1, Héctor Peña2 and J. Michael Jech3

1 Center for Coastal and Ocean Mapping, University of New Hampshire, Durham, NH, USA
2 Institute of Marine Research, PO Box 1870 Nordnes, N-5817 Bergen, Norway
3 Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA, USA

Correspondence to T. C. Weber: tel: +1 603 8621659; fax: +1 603 8620839; e-mail: weber{at}ccom.unh.edu.

Weber, T. C., Peña, H., and Jech, J. M. 2009. Consecutive acoustic observations of an Atlantic herring school in the Northwest Atlantic. – ICES Journal of Marine Science, 66: 1270–1277.

Several successive images of the same school of Atlantic herring (Clupea harengus) were collected over the course of ~1 h just north of Georges Bank in the Northwest Atlantic. Although the fish may not have been in their natural, undisturbed state, we observed what appeared to be the fish school fragmenting and dispersing, using a split-beam and a multibeam echosounder. Calibrated, 38 kHz, split-beam echosounder (Simrad EK60) and trawl-catch data provided accurate measures of the fish density beneath the vessel. Uncalibrated, 400 kHz, multibeam-echosounder (Reson 7125) data provided synoptic observations of the fish school including estimates of the school volume, morphology, and behaviour. Observations of the angular dependence in the multibeam-echosounder measurements of backscatter from fish allow investigation of the efficacy of extrapolating fish-school densities measured by the split-beam echosounder to the entire school.

Keywords: Atlantic herring, fish schools, multibeam echosounder, split-beam echosounder

Received 6 August 2008; accepted 6 December 2008; advance access publication 9 April 2009.


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